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Lines of Business (Tables)
 3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Lines of Business
The following is a summary of certain financial data for each of our segments (in thousands):

 
Animal
Hospital
 
Laboratory
 
All Other
 
Corporate
 

Eliminations
 
Total
Three Months Ended
March 31, 2017
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
568,181

 
$
90,549

 
$
18,639

 
$
—

 
$
882

 
$
678,251

Intercompany revenue
—

 
20,599

 
3,930

 
—

 
(24,529
)
 
—

Total revenue
568,181

 
111,148

 
22,569

 
—

 
(23,647
)
 
678,251

Direct costs
481,871

 
51,555

 
13,883

 
—

 
(23,526
)
 
523,783

Gross profit
86,310

 
59,593

 
8,686

 
—

 
(121
)
 
154,468

Selling, general and administrative expense
17,611

 
9,906

 
6,640

 
24,244

 
—

 
58,401

Operating income (loss) before sale or disposal of assets
68,699

 
49,687

 
2,046

 
(24,244
)
 
(121
)
 
96,067

Net loss on sale or disposal of assets
211

 
38

 
1

 
—

 
—

 
250

Operating income (loss)
$
68,488

 
$
49,649

 
$
2,045

 
$
(24,244
)
 
$
(121
)
 
$
95,817

Depreciation and amortization
$
26,658

 
$
2,908

 
$
829

 
$
692

 
$
(686
)
 
$
30,401

Property and equipment additions
$
19,603

 
$
7,640

 
$
1,118

 
$
1,621

 
$
(1,063
)
 
$
28,919

Three Months Ended
March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
458,623

 
$
89,240

 
$
14,454

 
$
—

 
$
1,122

 
$
563,439

Intercompany revenue
—

 
17,487

 
4,959

 
—

 
(22,446
)
 
—

Total revenue
458,623

 
106,727

 
19,413

 
—

 
(21,324
)
 
563,439

Direct costs
385,206

 
50,011

 
12,503

 
—

 
(21,061
)
 
426,659

Gross profit
73,417

 
56,716

 
6,910

 
—

 
(263
)
 
136,780

Selling, general and administrative expense
12,085

 
10,296

 
5,299

 
22,448

 
—

 
50,128

Operating income (loss) before sale or disposal of assets
61,332

 
46,420

 
1,611

 
(22,448
)
 
(263
)
 
86,652

Net loss (gain) on sale or disposal of assets
575

 
—

 
—

 
(12
)
 
—

 
563

Operating income (loss)
$
60,757

 
$
46,420

 
$
1,611

 
$
(22,436
)
 
$
(263
)
 
$
86,089

Depreciation and amortization
$
17,573

 
$
2,781

 
$
883

 
$
638

 
$
(586
)
 
$
21,289

Property and equipment additions
$
18,544

 
$
4,652

 
$
607

 
$
2,851

 
$
(848
)
 
$
25,806

 
 
 
 
 
 
 
 
 
 
 
 
At March 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
3,229,297

 
$
344,355

 
$
74,078

 
$
1,587,845

 
$
(1,774,897
)
 
$
3,460,678

At December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
3,137,177

 
$
331,484

 
$
74,752

 
$
1,502,150

 
$
(1,672,235
)
 
$
3,373,328